<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>标准流第三版</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    li {
        list-style: none;
    }

    div {
        margin: 0 auto;
        margin-bottom: 10px;
    }

    .top {
        height: 100px;
        background-color: gray;
    }

    .banner {
        /* float: right; */
        width: 910px;
        height: 200px;
        background-color: gray;
        /* padding-right: 100px;     */

    }
    .main {
        /* float: right; */
        width: 910px;
        height: 200px;
        background-color: gray;
    }

    .main li {
        float: left;
        width: 220px;
        height: 200px;
        background-color: pink;
        margin-right: 10px;
        
    }
    .main .las{
        margin-right: 0;
    }

    .box {
        /* float: right; */
        width: 910px;
        height: 400px;
        background-color: gray;
    }

    .box li {
        float: left;
        width: 220px;
        height: 400px;
        background-color: pink;
        margin-right: 10px;
        
    }
    .box .last{
        margin-right: 0;
    }


    .footer {
        /* float: right; */
        height: 150px;
        background-color: gray;
    }
</style>

<body>
    <div>
        <div class="top">top</div>
        <div class="banner">banner</div>
        <div class="main">
            <ul>
                <li>1</li>
                <li>2</li>
                <li>3</li>
                <li class="las">4</li>
            </ul>
        </div>
        <div class="box">
            <ul>
                <li>1</li>
                <li>2</li>
                <li>3</li>
                <li class="last">4</li>
                <!-- <li class="big">5</li>
                <li class="big">6</li>
                <li class="big">7</li>
                <li class="big">8</li> -->
            </ul>
        </div>
        <div class="footer">footer</div>
    </div>
</body>

</html>